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参数资料
| 型号： | DAC8571IDGKR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | DAC |
| 英文描述： | SERIAL INPUT LOADING, 13 us SETTLING TIME, 16-BIT DAC, PDSO8 |
| 封装： | GREEN, PLASTIC, MSOP-8 |
| 文件页数： | 16/30页 |
| 文件大小： | 825K |
| 代理商： | DAC8571IDGKR |
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Resistor
String DAC
Powerdown
Circuitry
VSense
VOUT
Amplifier
Resistor
Network
CURRENT CONSUMPTION
DRIVING RESISTIVE AND CAPACITIVE LOADS
AC PERFORMANCE
DAC8571
SLAS373A – DECEMBER 2002 – REVISED JULY 2003
After power-up, the device works in low power mode with its normal power consumption of 170 A at 5 V. At fast
settling mode, device consumes 250 A nominally, but settles in 10 s. For the three power-down modes, the
supply current falls to 200 nA at 5 V (50 nA at 3 V). Not only does the supply current fall but the output stage is
also internally switched from the output of the amplifier to a resistor network of known values. This has the
advantage that the output impedance of the device is known while in power-down mode. There are three
different options: The output is connected internally to GND through a 1-k
resistor, a 100-k resistor or it is left
open-circuit (high impedance). The output stage is illustrated in Figure 32.
A power on reset starts the DAC8571 in the low power mode. Low power mode and fast-settling mode settings
stay unchanged during DAC8571 data updates, unless they are specifically overwritten as explained in Table 6.
On the other hand, each new data sequence requiring a DAC update brings the DAC8571 out of the three
power-down conditions.
DAC8571 power settings can be stored in the temporary register, just like data (use C<7:0> = 0000 0001). This
allows simultaneous powerdown capability for multichannel applications.
Figure 32. Output Stage During Power-Down
All linear circuitry is shut down when the power-down mode is activated. However, the contents of the DAC
register are unaffected when in power-down. The time to exit power-down is typically 2.5 s for VDD = 5 V and
5 s for VDD = 3 V. (See the Typical Characteristics section for additional information.)
In the low power mode, the DAC8571 typically consumes 170 A at VDD = 5 V and 150 A at VDD = 3 V including
reference current consumption. Fast settling mode adds 80 A of current consumption, but ensures 10-s
settling. Additional current consumption can occur at the digital inputs if VIH<<VDD. For most efficient power
operation, CMOS logic levels are recommended at the digital inputs to the DAC. In power-down mode, typical
current consumption is 200 nA.
The DAC8571 output stage is capable of driving loads of up to 1000 pF while remaining stable. Within the offset
and gain error margins, the DAC8571 can operate rail-to-rail when driving a capacitive load. Resistive loads of 2
k
can be driven by the DAC8571 while achieving a very good load regulation. Load regulation error increases
when the DAC output voltage is close to supply rails. When the outputs of the DAC are driven to the positive rail
under resistive loading, the PMOS transistor of each Class-AB output stage can enter into the linear region.
When this occurs, the added IR voltage drop deteriorates the linearity performance of the DAC. This only occurs
within approximately the top 20 mV of the DAC's digital input-to-voltage output transfer characteristic. The
reference voltage applied to the DAC8571 may be reduced below the supply voltage applied to VDD in order to
eliminate this condition if good linearity is a requirement at full scale (under resistive loading conditions).
DAC8571 can achieve typical ac performance of 96-dB signal-to-noise ratio (SNR) and 65-dB total harmonic
distortion (THD), making the DAC8571 a solid choice for applications requiring low SNR at output frequencies at
or below 4 kHz.
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相关代理商/技术参数 |
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| DAC8571IDGKRG4 | 功能描述:数模转换器- DAC Lo-Pwr R-To-R Output 16-Bit I2C Input RoHS:否 制造商:Texas Instruments 转换器数量:1 DAC 输出端数量:1 转换速率:2 MSPs 分辨率:16 bit 接口类型:QSPI, SPI, Serial (3-Wire, Microwire) 稳定时间:1 us 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-14 封装:Tube |
| DAC8574 | 制造商:TI 制造商全称:Texas Instruments 功能描述:QUAD, 16-BIT, LOW-POWER, VOLTAGE OUTPUT, I2C INTERFACE DIGITAL-TO-ANALOG CONVERTER |
| DAC8574EVM | 功能描述:数据转换 IC 开发工具 DAC8574 Eval Mod RoHS:否 制造商:Texas Instruments 产品:Demonstration Kits 类型:ADC 工具用于评估:ADS130E08 接口类型:SPI 工作电源电压:- 6 V to + 6 V |
| DAC8574IPW | 功能描述:数模转换器- DAC Lo-Pwr Quad R-To-R Out 16-Bit I2C Input RoHS:否 制造商:Texas Instruments 转换器数量:1 DAC 输出端数量:1 转换速率:2 MSPs 分辨率:16 bit 接口类型:QSPI, SPI, Serial (3-Wire, Microwire) 稳定时间:1 us 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-14 封装:Tube |
| DAC8574IPWG4 | 功能描述:数模转换器- DAC Lo-Pwr Quad R-To-R Out 16-Bit I2C Input RoHS:否 制造商:Texas Instruments 转换器数量:1 DAC 输出端数量:1 转换速率:2 MSPs 分辨率:16 bit 接口类型:QSPI, SPI, Serial (3-Wire, Microwire) 稳定时间:1 us 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-14 封装:Tube |
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